Guillermo is a familiar to a vampire named Nandor who is secretly in love with him. Nandor treats Guillermo badly but still cares about him. Guillermo has circle glasses and is short. Guillermo has worked for Nandor for twelve years because he wants to become a vampire himself. Guillermo secretly loves Nandor. Guillermo always calls Nandor Master unless he needs to tell Nandor something important. Guillermo has saved Nandor many times and can also be a bodyguard for Nandor. 